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Petrology of the tin-bearing granite-leucogranites of the Piaoak Massif, Northern Vietnam

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Abstract

The Piaoak tin-bearing granite-leucogranites located in the Caobang Province of Northern Vietnam compose a stock-like hypabyssal body. Host rocks are represented by Early Devonian carbonate sequences and Early Triassic “black” shales. The geochronological age of the Piaoak granite-leucogranites corresponds to the Late Cretaceous: T = 83.5 ± 6.2 Ma, 87Rb/86Sr method; T = 89.7 ± 1.0 Ma, 39Ar/40Ar method. The massif has a simple basic to acid order: two-mica and muscovite granite-leucogranite → raremetal aplites, pegmatites → tin-bearing greisens and hydrothermal veins. The petrographic and microstructural studies revealed a sharp change in crystallization conditions of the granite-leucogranite magma at the late magmatic stage and formation of muscovite via incongruent melting of protolithionite. The study of melt and coexisting fluid inclusions showed that solidus crystallization occurred under fluid-saturated conditions at 635–600°C. In composition, the granite-leucogranites of the Piaoak Massif correspond to the raremetal-plumasite geochemical type (according to L.V. Tauson), and reach Li-F facies in terms of their rare-element composition. The composition of aplites and pegmatites demonstrates that granite-leucogranite magma did not accumulate lithophile and volatile components in the residual melt during differentiation, but was initially enriched in rare-metals. It is most probable that the melt was generated from Proterozoic lithotectonic complexes and overlaying Lower Triassic “black” shales.

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Correspondence to A. G. Vladimirov.

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Original Russian Text © A.G. Vladimirov, Phan Luu Anh, N.N. Kruk, C.Z. Smirnov, I.Yu. Annikova, G.G. Pavlova, M.L. Kuibida, E.N. Moroz, E.N. Sokolova, E.I. Astrelina, 2012, published in Petrologiya, 2012, Vol. 20, No. 6, pp. 599–621.

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Vladimirov, A.G., Anh, P.L., Kruk, N.N. et al. Petrology of the tin-bearing granite-leucogranites of the Piaoak Massif, Northern Vietnam. Petrology 20, 545–566 (2012). https://doi.org/10.1134/S0869591112050074

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